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Architectural Sustainability on the Impacts of Different Air- Conditioning Operational Profiles and Temperature Setpoints On Architectural Sustainability on the Impacts of Different Air- Conditioning Operational Profiles and Temperature Setpoints on Energy Consumption: Comparison between Mosques with and Without HVLS Fan in the City Center Mosques Nur Amalina Syairah Mohamed1 , Zalina Shari1*, Nur Dalilah Dahlan1, Ibiyeye Aminat Idowu2 1Department of Architecture, Faculty of Design and Architecture, Universiti Putra Malaysia, Serdang Malaysia 2Department of Architecture, Faculty of Environmental Sciences, Kaduna State University, Kaduna, Nigeria *[email protected] The use of air-conditioning (AC) in conjunction with high-volume, low-speed (HVLS) fans has become a trend in retrofitted mosque buildings in Malaysia to improve thermal comfort conditions. However, the energy impact of operating AC and HVLS fan simultaneously is unknown. This study compares the annual energy consumptions between mosques with and without HVLS fan installed and investigates the optimum temperature setpoints and operational profile to improve the mosques' energy efficiency. The Building Energy Intensity (BEI) comparison did not clearly show the superiority between the two groups in terms of energy performance. The study found that both studied mosques could produce around 1-4.9% energy reduction when the AC temperature setpoint was increased by 1˚C and could result in the highest cost-saving of about 4.9% when the temperature was set at 27˚C. A 30-minute AC operation during each daily prayer, except Subuh, could save between 14.8-16.7% annual energy consumption and about 15.2-16.6% annual energy cost. The paper concludes that the selection of 24-27˚C temperature setpoints with a 30-minute AC operational profile during prayers time, considering Friday prayers and Ramadhan activities, produced 18.4-20.6% savings in energy cost. This study calls for reevaluations of AC temperature setpoints configuration standards and operational characteristics in mosque buildings to reduce energy consumption. This paper contributes to the development of future energy standards for mosque designs and operations in Malaysia. Keywords: Temperature Setpoints, Operational Profile, Building Energy Intensity (BEI), High- Volume Low-Speed (HVLS) Fan, Air-Conditioning, Mosques, Malaysia 19 Journal of Design and Built Environment, Vol 21(2) 19-38, August 2021 Mohamed et al. 1. INTRODUCTION energy efficient (Shah et al., 2015). However, the extent to which the concurrent operation of both AC and HVLS fans affects the mosques' energy Mosques are a religious building type that is an performance still remains unclear. Do these essential part of any Muslim civil society. They mosques achieve the required thermal comfort are unique buildings in terms of their function and while consuming the least energy? This paper operation. Mosques are used not only for praying argues that when the operations of both AC and religious purposes but also for community system and HVLS fans are improperly designed, functions. Operationally, they are occupied it could result in additional, unnecessary amounts intermittently for performing prayers five times a of energy. day, all year round. Each occupancy is either partial or full and lasts at the most for an hour. An AC system's ultimate goal is to provide better Worshippers do not usually arrive or leave the indoor thermal comfort for building occupants; mosque simultaneously during this hour but hence, the system's proper operations must avoid rather at random. However, a maximum energy wastage. The comfort level is higher when occupancy generally occurs during each prayer's an air-conditioned room is integrated with a actual performance, which lasts between 15 to 20 ceiling fan (Chen et al., 2020). The air movement minutes. Some exceptions to this pattern of created by the ceiling fan keeps the building's occupancy occur during weekly Friday prayers, occupants feeling comfortable, although the the Taraweeh prayers during the nights of the setpoint temperature of the AC is high. A study month of Ramadhan (fasting month), and during by Wang and Lin (2013) found that 40% of other special occasions such as lecturing and energy saving can be achieved in an intelligent seminar activities, where people tend to stay building using a smart control AC and ceiling fan. longer in the mosques (Al-Homoud et al., 2005a). They explained that the airflow from a ceiling fan Understanding the functions and operations of could provide a cooling sensation to the mosques reflect the importance of thermal occupants. The strategy of increasing the AC design for occupants' comfortable praying thermostat temperature and adjusting the ceiling experience. Intermittent occupancy means fan speed to the medium can help achieve a mosques may not perform thermally the same as comfortable and energy-efficient environment typical commercial buildings. Installations of air- (Hawaii Natural Energy Institute, 2017). conditioning (AC) systems in mosque buildings to achieve the required thermal comfort have become common in the hot and humid climate region, particularly in Malaysian urban areas (Department of Standards Malaysia, 2014; Hussin et al., 2014). AC systems are responsible for the significant percentage of energy consumption in buildings. Malaysia's building sector contributes 40.5% of total national energy consumption (Malaysia Energy Commission, 2019) and 43.4% of total carbon dioxide emissions (Mohd Safaai et al., 2011). Figure 1: High-volume low-speed (HVLS) fan Recently, the use of AC system in conjunction Source: Author with high-volume, low-speed (HVLS) fans to achieve the desired thermal comfort in the main Currently, little information on energy prayer halls has become a common trend in performance or building energy intensity (BEI) of mosques located in Malaysian urban areas, such mosque buildings is available. An early study by as in Kuala Lumpur, Selangor and Johor (Othman Al-Homoud et al. (2005a) showed that the et al., 2019; Yendo et al., 2015). As shown in average BEI value of five mosques in Saudi Arabia was 167 kWh/yr/m2. The figure increased Figure 1, the HVLS fan is a new generation of 2 ceiling fan with a large fan diameter design that to 181.9 kWh/yr/m after the subsequent data can cover a large area at a slow-motion speed collections and analyses (Al-Homoud et al., (Moshfeghi et al., 2014). Specifically, it has 2005b). In Malaysia, a recent study by Hussin et airfoil blades measuring a minimum of 2.1-meter al. (2019) on five retrofitted air-conditioned in diameter with a rotation in the range of 50-125 mosques in Penang revealed that three of the mosques demonstrated BEI values of between 70 revolutions per minute to produce a minimum 2 airflow of 140,000 cubic feet per minute to 124 kWh/yr/m , which are lower than the BEI of office buildings by Saidur and Masjuki (130 (Moshfeghi et al., 2014). HVLS fan does not only 2 provide comfort, but the fan's motor is also kWh/yr/m ). The fourth mosque's BEI was 135 kWh/yr/m2, while the fifth was 323 kWh/yr/m2, a 20 Journal of Design and Built Environment, Vol 21(2) 19-38, August 2021 Mohamed et al. significantly higher value than the BEI of al., 2020; Xu et al., 2013). hospitals (244.8 kWh/yr/m2) by Moghimi et al. (2011). As Hussin et al. (2019) is so far the only Among the behavioural interventions to reduce study on mosque BEI in Malaysia, it was energy consumption are fine-tuning the AC considered appropriate for their BEI values to be temperature setpoints and revisiting the AC used as the baseline in this paper. The high BEI operational profiles. An adjustment to the AC results from Al-Homoud et al. (2005b) and temperature setpoints is made according to the Hussin et al. (2019) highlight the need for more desired indoor thermal comfort (Aghniaey & energy retrofit measures in mosque buildings. Lawrence, 2018; Yan et al., 2019b), but research Although these studies focused on air- has shown that an increase of 1oC in AC conditioned mosques, they ignored the usage of temperature setpoint will reduce at least 7% of HVLS fans. energy consumption (Ho et al., 2009). A growing number of studies conducted in hot climatic Energy retrofit is one of the instruments used to regions show that adjustments to the AC improve buildings' energy performance (Rogeau temperature setpoints significantly impact et al., 2020). There are two types of energy building energy consumption. These studies were retrofits: technical configurations and conducted in Singapore (Tom, 2008; Tushar et behavioural interventions (i.e. human-based al., 2016), Malaysia (Mustapa et al., 2017), retrofits). Technical configurations involve Thailand (Yamtraipat et al., 2005), Indonesia rearranging, replacing, adding and deleting some (Hamzah et al., 2018; Sunardi et al., 2020) and existing components of the buildings (Brown et South Africa (Wang et al., 2013). These studies al., 2014; Mancini & Nastasi, 2019; Sánka & have recommended different ranges of Petráš, 2019). The discussion of this approach temperature setpoints for thermal comfort. revolved around better bioclimatic designs and Although there is no specific point when the more energy-efficient insulation, windows and effect of temperature is dissatisfactory in terms of HVAC systems (Ariosto et al., 2019; Fang & thermal comfort to the users, controlling the AC Cho, 2019; Jankovic, 2019). Technical temperature setpoints has been reported to be one configurations type of energy retrofits has been of the means of managing the building energy widely studied for schools (Ali & Hashlamun, consumption (Aghniaey & Lawrence, 2018). 2019; Tahsildoost & Zomorodian, 2015), commercial (Li et al., 2020), offices (Mohamad et A reevaluation of the AC operational profile, on al., 2018; Somasundaram et al., 2020) and the other hand, involves strategising the AC residential buildings (Friedman et al., 2014; Wu operation schedule based on a deep understanding et al., 2017). Despite their advantages, such of the building usage, occupancy load, climate retrofit measures are complex as they involve factors, and occupancy duration of the building large-scale modifications, high upfront capital (Knight, 2016; Xia et al., 2019; Yang & Becerik- cost, and long implementation time (Cajot et al., gerber, 2014).
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